Lock.



Ptemed Nov. u, |902.

D. STODDABD.

LOCK.

{Application led July 28, 1902.)

(N0 Model.)

WITNESSES.

UNTTED STATES PATENT OEEICE.

OSCAR STODDARD, OF DETROIT, MICHIGAN, ASSIGNOR TO BATTLE CREEK NOVELTY COMPANY, LIMITED, OF BATTLECREEK, MICHIGAN.

LOCK.

SPECIFICATION forming part of Letters Patent No. 713,359, dated November 11, 1902.

Application tiled July 28,1902. Serial No. 117,279. (No model.)

To @ZZ whom, it may concern.- to be mounted and the manner in which said Be it known that I, OSCAR STODDARD, a citi plate is secured in position. zen of the United States, residing at Detroit, Referring to the characters of reference, l

in the county of Wayne, State of Michigan, designates the lock-case, in which is the usual have invented certain new and useful Imlatch-bolt 2, lock-bolt 3, and its accompany- 55 provements-in Door-Locks; and I do declare ing tumbler 4., all of which parts may be of the following to be a full, clear, and exact dethe usual or any desired construction. scription of the invention,`such as will enable The guard-plate 5 is adapted to cover the others skilled in the art to whichit appertains inside of the keyhole-openings in the plates io to make and use the same, reference being of the lock-case and is moved from side to 6o had to the accompanying drawings, and to the side as the key is inserted upon opposite sides igures of reference marked thereon, which of the lock. In this transverse movement of form a part of this specification. said guard-plate it must be supported so as This invention relates to door-locks; and it to enable it to slide easily and to maintain it consists in the construction and arrangement in position. In order to avoid mounting the 65 of parts hereinafterfully set forth, and pointguide-pins in the plate of the lock-case to ed out particularly in the claims. carry said guard-plate, I provide a thin plate The object of the invention is to provide an 6,' of sheet-steel, in which are secured guideattachment for door-locks by means of which pins 7. This plate 6 is adapted to be located 2o a guard-plate will be made to cover and close within the lock-case and to lie contiguous to 7o the keyhole-opening in the lock-plate oppothe front plate 8 thereof. Vithin the upper site to that from which the key is inserted, edge of the plate 6 is formed a notch 9, and whereby the picking of the lock is obviated through said plate is formed an opening lO. when the door is locked and the key is left Vhen the plate 6 is placed in position in a therein, the arrangement being such as to enlock of the character shown, a projection on 75 able the guard-plate to be placed in all locks the boss 1l, formed on the plate Bof the lockof ordinary construction without changing case and threaded to receive the screws which their parts. bind the plates of the case together, enters The above object is attained by the associthe notch 9, while a post 12, which engages 3o ation of operative parts illustrated in the acthe tumblers and lock-bolt, passes through 8o companying drawings, in whichthe opening 10, whereby the plate 6 is se- Figure l is an elevation of the interior of curely retained in position. an ordinary door-lock having my improved Formed through the main plate 6 is a cirfeature attached thereto. Fig. 2 is a vertical cular opening 13, in which the wing of the key sectional view through a portion of the lock, is adapted to turn freely when said key is in- 85 as on line 2 2, Fig. l, the key being inserted serted in the front plate of the lock-case. in the lock and having the wing thereof While the boss ll and post 12 may not be conturned to a vertical position. Fig. 3 is a horiveniently present in every style of lock, there Zontal section through the lock, as on line 3 3 is always some projecting stud that the plate 4o of Fig. l, showing the relative position of the 6 may be'made to engage with to hold it in 9o parts with the key inserted therein and. its position, and in fitting a lock with this imwing turned to a horizontal position. Fig. 4 proved attachment it is only necessary to is a perspective View of the plate located stamp the plate 6 in accordance with the parwithin the lock, having the pins upon which ticular arrangement of said lock, so that said the guard-plate is adapted to slide, said guardplate may be made to engage with such posts 95 plate being illustrated by dotted lines. Fig. or studs as project from the plate thereof. 5 is an elevation of said guard-plate. Fig. 6 By this arrangement no alteration need bel is an elevation of the key. Fig. 7 is a fragmade in a lock to enable it to be equipped mentary view showing the plate within the with my improved keyhole-guard,which may 5o lock upon which the guard-plate is adapted be placed in any lock by simply forming the roo plate 6 so that it will be retained in its proper position therein.

The guard-plate 5 is mounted upon the posts 7, whichpass through the apertures 14 therein. It will be observed that the key when inserted in the lock does not iind a bearing in the opposite keyhole-opening upon which to turn. To provide such a bearing, an aperture 15 is formed in the upper edge of the guard-plate, in which the pin 16, projecting from the stem 17 of the key, ente'rs when inserted in the lock from either side, thereby affording a bearing upon which the key may turn. The guard-plate slides transversely of the lock upon the pins 7 when the key is inserted and closes thekeyhole-opening in the lock-case opposite to that occupied by the key, as illustrated in Figs. 2 and 3.

When the key is inserted through the front plate 8 of the lock, it engages the guard-plate 5 and moves vit across the lock, so as to cover the keyhole-opening 18 in the back plate 19, as shown in Fig. 3. When the key is inserted through the back plate ot' the lock, the guardplate 5 is moved across the lock, so as to stand over the keyhole-opening of the plate 8, as shown in Fig. 2, whereby the picking of the lock is prevented when the door is locked and the key is left remaining in the lock.

Vhen the guard-plate is in the position shown in Fig. 2 and by dotted lines in Fig. 4 and the door is locked, the key will bear against said plate over the opening 13 in the plate 6. The diameter of said opening 13 is such that the plate 5 has bearing only at a point near its ends, whereby it is allowed to spring inwardly, and is made of spring metal, so that its resiliency may be utilized to assist in binding the key in the lock and prevent the key from being jarred therefrom by any manipulation of the plate 5 through the keyhole which it closes. To obtain a like result when the key is inserted from the opposite side, as shown in Fig.` 3, the plate 5 is provided at its ends with flanges 21, which bear against the inner face of the lok-plate19,

holding the body of the plate 5 slightly away from the lock-plate and affording a slight spring movement to the guard-plate, which serves to bind the key in the lock, as said key is thereby confined between said spring guard-plate and the opposite plate of the lock-case.

Having thus fully set forth my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a lock, the combination with the lockcase having the keyhole-openings therein, an insertible member in the lock-case carrying laterally-projecting.guide-pins, and a movable guide-plate mounted upon said guidepins in alinement with the keyhole-openings in the case of the lock.

2. In a lock, the combination of the lockcase having keyhole-openin gs therein, a main plate adapted to be inserted in the lock, and having an opening in which the key may turn, means for holding the main plate within the lock-case against movement, guide-pins fixed in the main plate, a guard-plate mounted to slide upon said pins and to alternately close the key-openings in the case when moved from side to side.

3. In a lock, the combination of the lockcase having keyhole-openings therein, an insertible plate fixed within the lock-case and having an opening through which the key may pass, guide-pins projecting from said plate on either side of said opening, a spring guardplate mounted to slide upon said pins, and to bear upon the margins of said opening, said plate having a lateral Iiange at each end adapted to bear upon the plate of the lock when carried into contact therewith by the key.

In testimony whereof I sign this specification in the presence of two witnesses.

OSCAR STODDARD.

Witnesses:

E. S. WHEELER, M C. PooLE. 

